Hydrogen peroxide decomposes to water and oxygen.
In this reaction, rate of reaction is measured by the changes in volume of oxygen gas released per unit time.
Rate of reaction can be shown by a steeper curve.
Curve Q has a steeper curve. The rate of reaction is higher. The possible factors affecting the rate of reaction is : size, concentration, temperature, pressure and catalyst. The possible factor mostly is concentration. Higher concentration, higher rate of reaction.
Curve Q shows that volume of gas released is lesser.
Volume of oxygen gas released depends at the quantity of reactant(in more specific, number of moles of hydrogen peroxide used).
Number of moles of hydrogen peroxide used in the initial experiment is
(0.1 x 25)/1000 = 0.0025
After determining number of moles of hydrogen peroxide given in A, B, C & D.
Only the number of moles of hydrogen peroxide in C is the smaller than 0.0025.
The correct answer : C
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